At moderate speed indicates a comfortable pace of movement or action. To express the opposite meaning, antonyms like "briskly", "hurriedly", "quickly", "swiftly", and "hastily" can be used. These words indicate a fast or rapid pace, which may be suited for certain situations where time is of the essence or urgency is required. Similarly, antonyms like "slowly", "leisurely", "cautiously", "tardy", and "lazily" can be used, which express a slower pace of movement or action. These words may be more appropriate for situations where a relaxed or cautious approach is needed, such as when dealing with delicate tasks or delicate situations.